1991-2020 Degrees Fahrenheit 1 53.9 52.5 1.4 66 28 1947 1982 2015 2012 top-third 2 45.3 46.1 -0.8 44 50 1947 2010 2014 2015 normal 1931 3 41.0 39.8 1.2 75 19 1950 2010 2015 2012 top-third 1962 4 35.9 34.4 1.5 78 16 1934 2010 2015 2012 top-third 5 32.6 30.9 1.7 80 14 2014 2012 2015 2012 top-third 1973 6 32.8 29.7 3.1 86 6 2014 2012 2015 2012 top-tenth 7 33.9 30.5 3.4 87 5 1934 2012 2015 2012 top-tenth 2017 8 35.5 32.5 3.0 87 5 1934 2012 2015 2012 top-tenth 9 38.7 35.4 3.3 88 4 1934 2012 2015 2012 top-tenth 10 41.4 38.5 2.9 89 3 1934 2012 2015 2012 top-tenth 11 43.6 41.0 2.6 89 3 1934 2012 2015 2012 top-tenth 1999 12 44.9 42.7 2.2 87 5 1934 2012 2015 2012 top-tenth 1998 18 38.6 38.3 0.3 69 21 2015 1999 2015 2013 top-third 1992,2001 24 42.3 42.7 -0.4 65 25 1935,2015 2017 2015 2013 top-third 1955,1984,1985,1991 36 41.3 42.7 -1.4 35 53 1936 2000 2015 2014 normal 1970 48 41.8 42.7 -0.9 53 33 1937 2013 1997 2015 normal 1957,1993 60 42.7 42.6 0.1 64 20 1938 2002 2015 2014 top-third 1999